Pressure Control Valve Stability via Non-Magnetic Mediator
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Solution Overview
Problem
Pressure control valves in fuel injection systems experience instability due to the influence of constant or varying low-pressure side pressures (return pressure), leading to discontinuities and poor control quality in their pressure-flow characteristic diagrams.
Innovation Solution
Reducing the volume between the magnet armature and the flat housing surface filled with diverted high-pressure medium, and filling this reduced volume with a non-magnetic material to decouple the armature plate's volume from the medium's diversion volume, thereby minimizing hydraulic forces and instabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the volume between the magnet armature and the flat housing surface is reduced, then stability against back pressure is improved, but the gap for medium diversion is reduced
Solution Approach 1:
A non-magnetic material is introduced as an intermediary substance to fill the gap between the magnet armature and the flat housing surface. This mediator allows the gap to be physically present for medium diversion while preventing the formation of unstable hydraulic forces, thus resolving the contradiction between maintaining gap volume and improving stability.
2Stability of the object's composition
If the volume between the magnet armature and the flat housing surface is reduced, then hydraulic forces causing instability are reduced, but the control range is affected
Solution Approach 1:
The non-magnetic material acts as a mediator that preserves the functional gap volume needed for control range while eliminating the harmful hydraulic forces. This allows the pressure control valve to maintain its adaptability and control range without sacrificing stability.
3Stability of the object's composition
If the residual air gap is minimized, then instabilities are reduced, but the volume for medium diversion is reduced
Solution Approach 1:
The non-magnetic material serves as a mediator that allows the residual air gap to be minimized for stability while maintaining the necessary volume for medium diversion through the gap, as the non-magnetic material does not interfere with the fluid flow path.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces instabilities and enhances the robustness of the pressure control valve, ensuring a continuous and stable pressure-flow characteristic even under increased back pressures, as evident from the improved pressure/flow characteristic diagrams.
Implementation Method 1
the smaller volume reduces the effective hydraulic forces that cause the instabilities in the pressure control valves known from the prior art
Implementation Method 2
The pressure control valve is actuated by an electric actuator
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a pressure control valve (20), particularly for a high-pressure accumulator body (72) of a fuel injection system. The pressure control valve (20) comprises a housing (22), an armature assembly (32) having an armature plate (34) and an armature pin (50). The armature plate (34) and a face (38) of the housing (22) delimit a volume (40) that can be filled with medium taken from the high-pressure accumulator (72). The volume (40) is reduced by a fill volume (42).